Crossword Genius

Extremely bird-like wings to boot (7)

Ross

I believe the answer is:

besides

I'm a little stuck... Click here to teach me more about this clue!

'to boot' is the definition.
(I've seen this before)

'extremely bird-like wings' is the wordplay.
I cannot really understand how this works, but
'wings' could be 'sides' (I've seen this in another clue) and 'sides' is present in the answer.
The remaining letters 'be' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for besides that I've seen before include "Moreover" , "to boot" , "also is available" , "See bids (anag)" , "In addition, as well" .)

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